Example usage for java.sql Connection close

Introduction

In this page you can find the example usage for java.sql Connection close.

Prototype

void close() throws SQLException;

Source Link

Document

Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.

Usage

From source file:ExecuteMethod.java

public static void main(String[] args) {
    Connection conn = null;
    Statement stmt = null;/* w ww  .  jav  a2 s.  c  o m*/
    ResultSet rs = null;
    boolean executeResult;
    try {
        String driver = "oracle.jdbc.driver.OracleDriver";
        Class.forName(driver).newInstance();
        System.out.println("Connecting to database...");
        String jdbcUrl = "jdbc:oracle:thin:@localhost:1521:ORCL";
        conn = DriverManager.getConnection(jdbcUrl, "test", "mypwd");
        stmt = conn.createStatement();

        String sql = "INSERT INTO Employees VALUES" + "(1,'G','4351',{d '1996-12-31'},500)";
        executeResult = stmt.execute(sql);
        processExecute(stmt, executeResult);

        sql = "SELECT * FROM Employees ORDER BY hiredate";
        executeResult = stmt.execute(sql);
        processExecute(stmt, executeResult);
    } catch (Exception e) {
        e.printStackTrace();

    } finally {
        try {
            if (conn != null)
                conn.close();
        } catch (SQLException se) {
            se.printStackTrace();
        }
    }
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    st = conn.createStatement();// www  .j ava 2 s . c om
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    ResultSetMetaData rsMetaData = rs.getMetaData();

    int numberOfColumns = rsMetaData.getColumnCount();
    System.out.println("resultSet MetaData column Count=" + numberOfColumns);

    for (int i = 1; i <= numberOfColumns; i++) {
        System.out.println("column MetaData ");
        System.out.println("column number " + i);

        // indicates whether values in the designated
        // column are signed numbers.
        System.out.println(rsMetaData.isSigned(i));
    }

    st.close();
    conn.close();
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    st = conn.createStatement();/*  w w w .  ja  va 2 s . c  om*/
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    ResultSetMetaData rsMetaData = rs.getMetaData();

    int numberOfColumns = rsMetaData.getColumnCount();
    System.out.println("resultSet MetaData column Count=" + numberOfColumns);

    for (int i = 1; i <= numberOfColumns; i++) {
        System.out.println("column MetaData ");
        System.out.println("column number " + i);

        // Indicates whether the designated column
        // is definitely not writable.
        System.out.println(rsMetaData.isReadOnly(i));
    }

    st.close();
    conn.close();
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    st = conn.createStatement();/* w  w w .j  av  a2s .co m*/
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    ResultSetMetaData rsMetaData = rs.getMetaData();

    int numberOfColumns = rsMetaData.getColumnCount();
    System.out.println("resultSet MetaData column Count=" + numberOfColumns);

    for (int i = 1; i <= numberOfColumns; i++) {
        System.out.println("column MetaData ");
        System.out.println("column number " + i);

        // Indicates whether a column's case matters
        // in the designated column.
        System.out.println(rsMetaData.isSearchable(i));
    }

    st.close();
    conn.close();
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    st = conn.createStatement();/*from w w w . j a  v  a  2  s.c  o  m*/
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    ResultSetMetaData rsMetaData = rs.getMetaData();

    int numberOfColumns = rsMetaData.getColumnCount();
    System.out.println("resultSet MetaData column Count=" + numberOfColumns);

    for (int i = 1; i <= numberOfColumns; i++) {
        System.out.println("column MetaData ");
        System.out.println("column number " + i);

        // Indicates whether a column's case matters
        // in the designated column.
        System.out.println(rsMetaData.isCaseSensitive(i));
    }

    st.close();
    conn.close();
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    st = conn.createStatement();/*  www .jav  a2s  .  c  om*/
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    ResultSetMetaData rsMetaData = rs.getMetaData();

    int numberOfColumns = rsMetaData.getColumnCount();
    System.out.println("resultSet MetaData column Count=" + numberOfColumns);

    for (int i = 1; i <= numberOfColumns; i++) {
        System.out.println("column MetaData ");
        System.out.println("column number " + i);

        // gets the designated column's number of
        // digits to right of the decimal point.
        System.out.println(rsMetaData.getScale(i));
    }

    st.close();
    conn.close();
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    ResultSet rs = null;// w w  w  .j  a v a 2 s  . co  m
    DatabaseMetaData meta = conn.getMetaData();
    rs = meta.getTypeInfo();
    while (rs.next()) {
        // Get the database-specific type name
        String typeName = rs.getString("TYPE_NAME");

        // Get the java.sql.Types type to which this
        // database-specific type is mapped
        short dataType = rs.getShort(2);

        // Get the name of the java.sql.Types value.
        System.out.println("type name=" + typeName);
        System.out.println("dataType=" + dataType);
        System.out.println("jdbcType=" + dataType);
    }
    st.close();
    conn.close();
}

---

From source file:Join.java

public static void main(String args[]) {

    String url = "jdbc:mySubprotocol:myDataSource";
    Connection con;
    String query = "select SUPPLIERS.SUP_NAME, COFFEES.COF_NAME " + "from COFFEES, SUPPLIERS "
            + "where SUPPLIERS.SUP_NAME like 'Acme, Inc.' and " + "SUPPLIERS.SUP_ID = COFFEES.SUP_ID";
    Statement stmt;//from w  w  w  .j  a va 2  s .c  o  m

    try {
        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {
        con = DriverManager.getConnection(url, "myLogin", "myPassword");

        stmt = con.createStatement();

        ResultSet rs = stmt.executeQuery(query);
        System.out.println("Supplier, Coffee:");
        while (rs.next()) {
            String supName = rs.getString(1);
            String cofName = rs.getString(2);
            System.out.println("    " + supName + ", " + cofName);
        }

        stmt.close();
        con.close();

    } catch (SQLException ex) {
        System.err.print("SQLException: ");
        System.err.println(ex.getMessage());
    }
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getHSQLConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("create table survey (id int,name varchar);");
    st.executeUpdate("create view surveyView as (select * from survey);");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
    st.executeUpdate("insert into survey (id,name ) values (2,'anotherValue')");

    String sqlQuery = "SELECT * FROM survey";
    WebRowSet webRS = new WebRowSetImpl();
    webRS.setCommand(sqlQuery);/*  ww w .jav a 2 s .co  m*/
    webRS.execute(conn);

    // create RowSetMetaData object
    RowSetMetaData rsMD = (RowSetMetaData) webRS.getMetaData();
    System.out.println("rsMD=" + rsMD);
    if (rsMD == null) {
        System.out.println("vendor does not support RowSetMetaData");
    } else {
        int columnCount = rsMD.getColumnCount();
        System.out.println("columnCount=" + columnCount);
    }
    conn.close();
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    st = conn.createStatement();//w  w w . jav a 2s .co m
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    ResultSetMetaData rsMetaData = rs.getMetaData();

    int numberOfColumns = rsMetaData.getColumnCount();
    System.out.println("resultSet MetaData column Count=" + numberOfColumns);

    for (int i = 1; i <= numberOfColumns; i++) {
        System.out.println("column MetaData ");
        System.out.println("column number " + i);

        // indicates whether a write on the designated
        // column will definitely succeed.
        System.out.println(rsMetaData.isDefinitelyWritable(i));
    }

    st.close();
    conn.close();
}

---

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